Jiuzhaigou Conservation is a typical karst region with scenic tufa constructive landscape. With observation in situ and optical microscope as well as scanning electronic microscope, a series minor and micro biokarst solution features and related agents were identified and described related to local environmental condition, and also the bioeffect on karst deposition in formation of the local tufa dammed lakes were elucidated and discussed. It is shown in the cycle model proposed in the paper that many organisms (algae, mosses, and bushes etc.) with various effects (assimilation, interception, encrustation, trapping and binding etc.) on tufa deposition play an important role throughout the compound cycle process of the tufa dam gradation, i.e. the formation of the tufa dammed lakes in the stream channels which are character of local karst landscape.