In the measurement system of hydraulic model tests, the water parameter measuring instruments must be used in
dusty, wet air and muddy water. Because of this special test environment, the water parameter measuring instruments
using contact measurement mode have high failure rate in use, heavy workload in maintenance, much difficulties in
installation, so they are not conducive to the volume promotion and applications. To avoid the shortage of contact
measurement technology, this paper uses non-contact measurement mode, develops laser topographic equipment and
makes the instrument with the characteristics of simple installation, reliable and easy to maintain, relaxed requirements
on the environment, and suitable for using in the dusty and humid environments.