The seismic environment,seismic background in middle-short term and integrative characters of anomalies in short term in the seismogenic process of Minle-Shandan earthquake are summarized systematicaly. On the base of common features of precursors in short term before middle-strong earthquacke in Qilian seismic belt,the main evidences and scientific judgement to short term prediction are expatiatied. Meanwhile,the method,difficulty and perplexed problems associated with the judgment are discussed.