Parallel imaging is a promising method to shorten the scanning time of 4D flow MRI. We applied SENSE, GRAPPA, SPIRiT and ESPIRiT in 4D flow imaging on six healthy volunteers and compared the accuracy of four algorithm. We found that ESPIRiT and SPIRiT showed the better velocity maps than SENSE and Grappa. The temporal fidelity of ESPIRIT can be the best among four methods, while SENSE and GRAPPA resulted in overestimates of peak flow. In conclusion, we validate the accuracy of four widely-used parallel imaging methods for the reconstruction of velocity map in 4D flow MR Imaging.