The study investigates the fundamental deformation mechanism underlying massive dislocation motions in body-centered cubic multi-principal element alloys (MPEAs) by developing an atomic-lattice-distortion-dependent discrete dislocation dynamics framework. The research reveals that dislocation flow turbulence, characterized by the turbulence of dislocation speed, is caused by strong heterogeneous lattice strain fields due to chemical short-range order (SRO). This turbulence not only initiates dislocation multiplication but also induces strong local pinning traps, blocking dislocation movement and breaking the traditional strength-ductility trade-off. The study demonstrates that SRO enhances both strength and ductility by creating a unique dislocation structure that serves as both a source and a trap at vortex points. This work provides insights into the design of high-strength and ductile MPEAs by tuning the amplitude and dispersion of heterogeneous lattice distortion.The study investigates the fundamental deformation mechanism underlying massive dislocation motions in body-centered cubic multi-principal element alloys (MPEAs) by developing an atomic-lattice-distortion-dependent discrete dislocation dynamics framework. The research reveals that dislocation flow turbulence, characterized by the turbulence of dislocation speed, is caused by strong heterogeneous lattice strain fields due to chemical short-range order (SRO). This turbulence not only initiates dislocation multiplication but also induces strong local pinning traps, blocking dislocation movement and breaking the traditional strength-ductility trade-off. The study demonstrates that SRO enhances both strength and ductility by creating a unique dislocation structure that serves as both a source and a trap at vortex points. This work provides insights into the design of high-strength and ductile MPEAs by tuning the amplitude and dispersion of heterogeneous lattice distortion.