Combining with equation theories of laser rate and propagating equations of pump and signal light in fiber lasers, a general traveling-wave theory model which is suitable to fiber lasers with line-shaped and ring-shaped cavity is proposed. And continuous wave (CW), active and passive Q-switched output can be simulat. ed. Comparing with traditional point models, the model has higher accuracy in theory for considering more ele. ments such as non-uniform distribution characteristic of pump and signal light in cavities as well as the influence on laser from different losses such as transmission and connection and non-doped fiber. According to finite differ. ence method (FDM), the numerical algorithm of traveling-wave model is educed. And the algorithm is implement. ed by VC 6.0 and hybrid programming technology of C/C++ and mideva. Numerical simulation analysis software with high operation efficiency and flexibility for fiber lasers is obtained finally. And plenty of dynamic operation in. formation of lasers is simulated by the software.