Abstract: The CEC is the most important chemical parameter to check the stability and maturity of the compost. The higher value of CEC at the end of composting process give the more mature compost without any phytotoxicity and increased germination index. The composting process can be speed up by the addition of some inoculum in it. The present study was designed to find out the CEC of mature compost produced by municipal solid waste, as CEC must be increased with the time interval in composting process. The value of CEC depends on the nature of waste used for composting. It was concluded that the mature compost was formed by using MSW after 3 months of composting process with the addition of commercially available inoculum BST alone and with addition of molasses. The higher value of CEC was given by the windrows treated with BST inoculum without the addition of molasses.