Abstract: A new solid-state calorimeter for intense lasers was presented. A numerical calculation model was setup to study the laser absorbed procedure. An energy absorbing cavity, constructed with several segments that were nearly heat insulating from each other, was designed, which had characteristics of high threshold on laser induced damage, fast thermal balancing and higher energy absorbed ratio. A detector array was designed for temperatures measurements. According to the temperatures response characteristics of the segmented cavity, a calculating method, based on energy deposition, was developed to obtain the accurate laser energy, which had good adaptability on irregular laser energy intensity distributions. The results of validating experiments show that the calorimeter has good repetition and accuracy within the range of hundreds of kilo-joules.