The canonical trend surface analysis(CTSA)was introdused into ecological study.CTSA is the combination of a canonical correlation analysis and trend surface analysis(TSA).The horizonal pattern of Form. Hippophae rhamnoides was analyzed with CTSA.The patterns of 6 species was analyzed simultaneously and the result reflected the pattern variation of Hippophae rhamnoides,Rosa Xanthina,Ostrgopsis spp.correctly.The importance value of Hippophae rhamnoides increased from southeast to northwest. Rosa X...