Abstract: The data of monthly rainfall, observed from 18 stations of Henan Province during 1951-2013, were selected as the subject for analyzing the temporal-spatial characteristics of Henan rainfall and 800 mm rainfall line, with wavelet analysis, Mann-Kendall test, rainfall variability and cumulative departure methods. The results showed that: (1) the rainfall of annual and four seasons had non-significant decreasing trend in Henan Province, the variations of annual rainfall was primarily controlled by the summer rainfall, the extent of drought was bigger than that of flood; (2) there were typical oscillations with 2-3 a, approximate 4.5 a and 6 a cycles in the annual and seasonal mean precipitation variation, which were possibly relate to the El Nino/Southern Oscillation; (3) the rainfall of annual and four seasons decreased from southeast to northwest, and most areas of Henan Province had a decreasing trend; (4) only regarding the 800 mm rainfall as the separatrix of southern and northern China seemed to be insufficient, more substitute indexes were needed to comprehensively analyze the specific trend and width range.