From　the　idea　of　unified　energy　management,　this　paper　analyzed　the　composition　and　the　energy　saving　ways　of　the　cooling　source　in　intelligent　building,　established　the　applicable　chiller　plant　control　algorithmic　modules　on　the　basis　of　the　innovative　control　strategy　of　cooling　on　demand　and　the　control　module　library.　Study　focused　on　the　optimized　control　algorithms　of　the　chilled　water　supply　temperature　set-point　control　according　to　the　cooling　request　on　demand,　the　chiller　operating　numbers　and　proper　operating　order　and　running　cycle　control,　and　the　chilled　water　pump　frequency　conversion　control　according　to　the　cooling　request　on　demand.　The　feasibility　and　stability　was　tested　and　verified　in　the　laboratory.　The　ideal　effects　were　also　achieved　in　a　practical　project　in　Ningxia　Hui　autonomous　region,　China.　The　results　show　that　the　system　can　be　loaded/unloaded　efficiently,　and　the　fluctuation　of　water　temperature　at　the　chiller＇s　outlet　around　the　setpoint　remains　quite　small,　which　reflect　very　good　control　precision　and　notable　energy-saving　effects.