The latest consumer price index was lower than in March but went up 1.5 percent year over year.
The inflation rate increased 1.3 percent in the first four months over the same period last year, according to data from the National Bureau of Statistics.
The inflation rate came in lower than expected, which will leave room for the government to ease its monetary policies.
China's economy grew 7.4 percent last year, the lowest growth in more than two decades. The economic slowdown is expected to persist.
Revised interest rate corridor system introduced