Proposal A is based on Dual-leaf windmill plan arrangement. Except for the main-leaf space, there is part of the space that could have the view to Yanghu Park. The separation of the two leafs has the advantage in facing the need of big enterprise and the enlarging of part of the plan provides the depth that could meet the requirement of the office space. Its façade, pure stream as theme, represents the trace of the wind from lake. Its brief and light form is like the wind of airplane, highlighting again the theme of stream.