By Fukushima-Daiichi accident, wide area of Eastern Japan were contaminated by radio-Cs.Some parts of radio-Cs are collected as combustible municipal solid wastes and incinerated to reduce the volume.Radio-Cs is concentrated by 20 to 30 times in fly ash in water soluble form.It is important to control the leaching of this radio-Cs when MSW incineration fly ash is disposed in controlled type final disposal site.For the purpose,cement consolidation is considered as useful.In this study, three kinds of mix proportion was evaluated.The first one is aimed to dispose MSW incineration fly ash efficiently but have lower strength.The second one is aimed to reduce leaching by higher strength.The last one is aimed to reduce leaching by nickel ferrocyanide immobilizer for Cs.In the paper, the leaching behavior in several months will be shown and the leaching estimation in a controlled type final disposal site will be explained.