Abstract: As the output signal of the phase modulator can not be directly detected by PD, the dual-parallel phase modulators have been used to build microwave photonic links that can achieve direct detection. The dual-parallel phase modulators microwave photonic links use two phase modulators. By setting the phase deviation difference between two PM as π, two phase modulated signals do not cancel each other at the receiving. Then the phase modulated signals can transmit in direct detection. This paper analyzes the theory of the links and simulates the model of the links. The results of the simulation show this link can effectively transmit phase modulated signal to the receiver and has some features such as simple structure, low noise, etc.