Powder is generally used for ready mixed concrete batching plant after weighing by truck， conveying to the powder cans and mixing plant production consumption. Purchase data from the client to the general pound metering summary statistics, consumption data produced by mixing station detail record data summary statistics, the difference between the two results is called powder gains and losses. Statistics all the factors involved in the process, consider mixing station here only part of the production of consumption problems that may arise, as a reference. A metering allowed. Second, summary statistics are not allowed. And it also has other reasons to check.