A two-step quantum direct communication protocol using Einstein-Podolsky-Rosen (EPR) pair blocks is proposed. The protocol uses a set of ordered N EPR pairs as a data block for sending secret messages directly. The EPR pairs are divided into two sequences: a checking sequence and a message-coding sequence. After transmitting the checking sequence, Alice and Bob perform eavesdropping checks by randomly measuring a subset of particles. If the channel is secure, Alice encodes the secret message on the message-coding sequence and sends it to Bob. Bob then performs Bell-basis measurements on the EPR pairs to read out the encoded messages. The scheme is secure because an eavesdropper cannot access both sequences simultaneously. The protocol is secure and has high capacity, as each EPR pair carries two bits of classical information. The security is ensured by the secure transmission of the checking sequence. The protocol is similar to quantum key distribution (QKD) protocols, but differs in that it does not require a classical key for encryption. Instead, it uses shared EPR pairs as the quantum resource. The protocol is secure for an ideal noiseless channel and conditionally secure for a noisy channel. The scheme is implemented using a block of entangled particles divided into two sequences, which are sent from Alice to Bob in two steps. The protocol also proposes a concrete experimental setup for its realization. The scheme is completely secure for an ideal noiseless channel and conditionally secure with a noisy channel. The protocol is efficient and secure, making it suitable for specific applications. The protocol is based on the principles of quantum mechanics and uses EPR pairs as the quantum resource. The protocol is secure because an eavesdropper cannot access both sequences simultaneously. The protocol is efficient and secure, making it suitable for specific applications. The protocol is based on the principles of quantum mechanics and uses EPR pairs as the quantum resource. The protocol is secure because an eavesdropper cannot access both sequences simultaneously. The protocol is efficient and secure, making it suitable for specific applications.A two-step quantum direct communication protocol using Einstein-Podolsky-Rosen (EPR) pair blocks is proposed. The protocol uses a set of ordered N EPR pairs as a data block for sending secret messages directly. The EPR pairs are divided into two sequences: a checking sequence and a message-coding sequence. After transmitting the checking sequence, Alice and Bob perform eavesdropping checks by randomly measuring a subset of particles. If the channel is secure, Alice encodes the secret message on the message-coding sequence and sends it to Bob. Bob then performs Bell-basis measurements on the EPR pairs to read out the encoded messages. The scheme is secure because an eavesdropper cannot access both sequences simultaneously. The protocol is secure and has high capacity, as each EPR pair carries two bits of classical information. The security is ensured by the secure transmission of the checking sequence. The protocol is similar to quantum key distribution (QKD) protocols, but differs in that it does not require a classical key for encryption. Instead, it uses shared EPR pairs as the quantum resource. The protocol is secure for an ideal noiseless channel and conditionally secure for a noisy channel. The scheme is implemented using a block of entangled particles divided into two sequences, which are sent from Alice to Bob in two steps. The protocol also proposes a concrete experimental setup for its realization. The scheme is completely secure for an ideal noiseless channel and conditionally secure with a noisy channel. The protocol is efficient and secure, making it suitable for specific applications. The protocol is based on the principles of quantum mechanics and uses EPR pairs as the quantum resource. The protocol is secure because an eavesdropper cannot access both sequences simultaneously. The protocol is efficient and secure, making it suitable for specific applications. The protocol is based on the principles of quantum mechanics and uses EPR pairs as the quantum resource. The protocol is secure because an eavesdropper cannot access both sequences simultaneously. The protocol is efficient and secure, making it suitable for specific applications.