The paper presents version 3.4 of the CalcHEP software package, designed for evaluating and simulating high-energy physics collider processes at the parton level. Key features include Feynman diagram computation, multi-particle phase space integration, and event simulation. CalcHEP offers an easy startup, a user-friendly graphical interface, the ability to modify models, and a batch interface for complex calculations. The new version includes improvements such as enhanced model implementation, support for various Beyond the Standard Model (BSM) theories, and tools for generating matrix elements for external packages. The paper also covers installation, interactive and non-interactive sessions, file handling, and batch scripts, providing detailed instructions and examples for users.The paper presents version 3.4 of the CalcHEP software package, designed for evaluating and simulating high-energy physics collider processes at the parton level. Key features include Feynman diagram computation, multi-particle phase space integration, and event simulation. CalcHEP offers an easy startup, a user-friendly graphical interface, the ability to modify models, and a batch interface for complex calculations. The new version includes improvements such as enhanced model implementation, support for various Beyond the Standard Model (BSM) theories, and tools for generating matrix elements for external packages. The paper also covers installation, interactive and non-interactive sessions, file handling, and batch scripts, providing detailed instructions and examples for users.