In mashup, widget coordination is an essential requirement. In this paper, the authors propose three models: widget representation, widget coordination, mashup application. In order to enhance widget combination, in the widget coordination model, they suggest two additional representations: parameter transformation mapping, and parameter structure construction respecting to coordination demand. Through 12 experiment scenarios, it proves that these models proposal has improved inter-widget combination capability. In addition, it has restricted the dependency of parameter structure between widgets, supported late-binding capacity compared to approaches of widget representation at present, such as: IBM, I. Yu.