The influence of combined alternating and static magnetic fields on rat behavior in the "open field" test was studied. The action of the cyclotron and Larmor frequencies of calcium, natrium, potassium, chlorine, magnesium, lithium, and zinc ions was investigated. The statistically significant influence of the cyclotron frequencies of calcium and magnesium ions was revealed. The calcium frequency caused depression of investigating activity of the animals and the magnesium one evoked increasing moving and investigating activities. The rest of frequencies did not significantly act on the animal behavior.