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The analysis is based on the data collected continually by WSIRCMS at Beijing Meteorological Observatory in November 2011. The analysis aims to evaluate preliminarily the detectability of WSIRCMS on total cloud cover, cloud base height, and sky types. The results indicate: (1) The instrument can conduct continuous automatic detection day and night towards cloud height, cloud cover (includes high, medium, low and total cloud cover) as well as sky types. (2) Samples whose difference from the reference standards is within ±10%, account for 72.5% of the total sample. The detection capability towards medium and high clouds is weaker when haze happens, which leads to great differences among observations of cloud covers. (3) When there is no cloud, the data consistency of results from WSIRCMS and ceilometers reaches 94.9%. The observed results conform fairly well under the condition of low or medium clouds. But towards high clouds, the observed results from WSIRCMS are higher than those from ceilometers. (4) Samples that conform with results of sky types under manual classification account for 82.63% of the total sample, but WSIRCMS does not show high identification capability towards undulates clouds, cumuliform clouds, and mixed clouds.