To improve the utilization of spectrum resources and solve the problem of large volume of traditional filter, a metamaterial filter with a compact size of 15 mm×20 mm was designed by using the high integration split-ring resonators. Based on time domain finite integral method, the response between the reflection coefficient curve of the split-ring structure filter and the electromagnetic parameters was analyzed. By loading tunable diode into the gap of split-ring, the filter was continuously tunable at X-ray band (from 10.9 GHz to 12 GHz), extending the operating frequency band of the filter. The bandwidth of the designed filter is about 11.0%，return loss minimum is 32 dB and insertion loss maximum is 0.38 dB. The results illustrate that the split-ring metamaterial filter shows the characteristics of compact size, wide bandwidth and good band pass.