Micro Electro mechanical Systems (MEMS) gyroscope has been widely used in military and civilian fields due to its low cost and compactness, but there is still issue of insufficient zerobias stability. To improve this performance, a scalable and portable hardware platform with a size of only 45 mm×55 mm×30 mm is designed in this paper. On this platform, multiscale fusion algorithm in wavelet domain is applied to process the original data of the four MEMS gyroscopes by realtime wavelet fusion. The test results show that the system is stable and reliable, and the variance of fused data is reduced by one order of magnitude compared with the original variance.