In　order　to　study　the　effect　of　size　effect　and　rate　correlation　on　the　mechanical　properties　of　concrete,　a　total　of　228　concrete　cube　test　blocks　of　three　sizes　(70,　100　and　150mm)　were　tested　and　studied　under　four　strain　rates　(10-5,10-4,10-3,10-2/s).　The　test　results　show　that　under　the　same　strain　rate,　the　peak　stress　of　concrete　decreases　with　the　increase　of　the　size.　Under　the　same　size,　the　peak　stress　of　concrete　increases　with　the　increase　of　strain　rate.　Experimental　data　were　used　to　verify　and　modify　Weibull　size　effect　equation　based　on　statistics　and　Bazant　size　effect　equation　based　on　fracture　mechanics.　The　experimental　data　fit　well　with　the　equation,　and　the　size　effect　theory　of　concrete　strength　with　correlation　of　holdup　is　established.　©　Published　under　licence　by　IOP　Publishing　Ltd.